Automatic violin-bow.



G. K. HENNIG.

AUTOMATIC VIOLIN BOW.

APPLICATION FILED NOV. e, 1913.

1,131,930. Patented Mar. 1 1915.

THE NORRIS PETERS 50., PHOTC-LITHO.. WASHINGTON. D. c.

GUSTAV KARL HENNIG, 0F BGI-ILITZ-EHRENBERG, NEAR.

ASSIGNOR TO THE FIRM LEIPZIG, GERMANY,

OF LUDWIG HUPFELD AKTIENGESELLSCHAFT, OF

BClI-ILITZ-EHRENBERG, NEAR LEIPZIG, GERMAN Y.

AUTOMATIC VIOLIN-BOW.

Application filed November 6, 1913.

To all whom it may concern. 7

Be it known that I, GUSTAV K RL Hn vuro, a subject of the King ofSaxony, residing at 1 Bielastrasse, Bohlitz-Ehrenberg, near Leipzig,Germany, have invented certa n new and useful Improvements in AutomaticViolin-Bows; and I do hereby declare the following to be a full, clear,and exact description of the invention.

This invention relates more particularly to the operation of the bowingelement, of pneumatically actuated stringed musical instruments, and hasfor its object to provide means whereby the bow can be driven in eitherone or the other direction at will like the customary bow moved by hand,the direction of driving being controlled either from the note sheet ofthe musical instrument, or by hand, or both.

The object of the invention is to simplify the structure, and therebypermit the use of considerably less elements than have hitherto beenused, and to reduce the cost of manufacture.

Referring to the drawings, in which l i re parts are similarlydesignated-Figure 1 1s a view, partly in section of note sheetcontrolled pneumatic mechanism for driving a ring bow. Fig. 2 is asimilar view of pneumatically controlled electric mechanism for the samepurpose. Figs. 1 and 2 show manually actuated means for driving theshaft in opposite directions. Fig. 3 is a plan view of a modification ofthe bowing member.

Referring now to Fig. 1, (Z is a customary ring bow, provided with adriving wheel d which is connected by means of a belt, cord, chain, orthe like, 0 to a small pulley or driving wheel 6 mounted on a crankeddriving shaft 6. Connected to the cranks of this driving shaft are twowind motors a and a arranged to drive the shaft 6 in oppositedirections. Wind motor a is connected by a conduit a? to avalve-controlled wind chest, the valves 6 of which are controlledthrough the conduit 7 by a music sheet m passing over the tracker bar 9.The other wind motor a is connected by a conduit a with a similar windchest controlled by valves 6, which valves are also controlled by themusic sheet 112. through the conduit f connected to the tracker bar g.

Specification of Letters Patent.

Serial No. 799,514.

The specific structure of wind motor, and the specific arrangement ofthe valves 6 and e are well known in the art.

The operation of the device is as follows: When a suitable perforationin the music sheet m passes over its corresponding openmg in tracker bar9 to admit outside air through the conduit 7 to the valves 6, suction isproduced in the conduit (4 and motor a is operated, and drives the shaftZ), and consequently the ring bow (Z in one direction. Anotherperforation in the music sheet 122 passing over the tracker bar 9 willadmit outside air through another tracker bar opening leading to theconduit 7 to operate the valves 6 to produce suction on the conduit (Z3leading to the other wind motor a, admission of outside air to theconduit being simultaneously cut off by the music sheet; consequentlythe wind motor a will be operated, and the bow driven in the oppositedirection.

In Fig. 2, 7a is a shaft common to two electric motors g and providedwith commutators 2' and brush holders t"; the brush holders are arrangedto be lifted from the commutators, and the motors are wound for rotatingin opposite directions. The tracker bar 9 is connected to valves 6 ande, as in ig. 1, and the conduits a and if instead of leading directly towind motors, lead, respectively, to pneumatics 72. and it, which operatethe brushes of the respective motors. hen the motors are not running thebrushes are lifted from their commutators. The direction of rotation ofthe ring bow d is controlled from the note-sheet m in a manner similarto that described with reference to Fig. 1, one or the other of thepneumatics h or it being deflated places the brush in contact with itscommutator, and

7 causes the operation of its motor, so that the bow is driven in one orthe other direction, in accordance with the control of the note sheet.The reversal of direction of driving of the ring bow may also beeffected by hand. For this purpose valves n n (Fig. 1 may be arrangedabove the conduits f f and may be turned by hand levers 0 0'. If the oneor the other of the motors is to be operated the corresponding valve maybe moved, so that air is admitted through the Patented Mar. 16, 1915.

corresponding opening of the respective conduit, in the same manner asby a suitable perforation in the note sheet. The control of the motorsmay also be effected by valves 9 which connect the branches 7" of theconduits a and a with the suction chambers s of the valve-casings 2%.Usually both valves by reason of springs 10 cover the openings of thebranches 0".

In the arrangement of Fig. 2 the controlling of the conduits f f iseffected by valves 29 p actuated by hand levers v turnably mounted inbearings 'w. By action of springs 00 the openings of the conduits areusually closed.

As illustrated in Fig. 3 the bowing member instead of being a ring bowmay be an endless band 11 in which case the driving connection 0 may beomitted. The band y runs over a pulley 2 and is driven directly from thepulley b on the shaft of the motors.

I claim as my invention:

1. The combination with a bowing mechanism; of a driving shaft for thebowing mechanism, motors arranged to drive said and mechanism motors.

2. The combination with a bowlng mechanism; of a driving shaft for thebowing mechanism, wind motors arranged to drive said shaft inoppositedirections, and mechanism for causing the operation of either of saidmotors.

3. The combination with a bowing mechanism; of a driving shaft for thebowing mechanism, motors arranged to drive said shaft in oppositedirections, and note sheet Copies of this patent may be obtained forfive cents each, by addressing the shaft in opposite directions, andmeans for manually or pneumatically controlling the operation of eitherof said motors.

6. The combination with a bowing mechanism; of a driving shaft for thebowing mechanism, wind motors arranged to drive said shaft in oppositedirections, and means for manually or pneumatically controlling theoperation of either of said motors.

7. The combination with a bowing mechanism, of a rotatablebow-driving-shaft from which said bowing mechanism is driven, two motorsto which said shaft is common and arranged for opposite rotation, andmeans for manually or pneumatically controlling the operation of eitherof said motors, bowing in one or the other direction is controlled.

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses.

Witnesses:

A. E. GEUDTNER, RUDOLIH'FRICKE.

Commissioner of Patents,

Washington, D. G.

whereby the duration of the

